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How do you correctly reason that this directed graph is acyclic?
Polynomial division: Is this trick obvious?
How to prove that $\sqrt{2+\sqrt3}-\sqrt{2-\sqrt3}=\sqrt2$ without squaring both sides
How do you explain to a 5th grader why division by zero is meaningless?
What is the closed form of the $f$ with $f(1)=1$, $f(2)=7$ and $f(n)=7f(n-1)-12f(n-2)$ ($n\ge 3$)?
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